4.4. Declaring a Method with a Parameter

In our car analogy in Section 4.2, we discussed the fact that pressing a car’s gas pedal sends a message to the car to perform a task—make the car go faster. But how fast should the car accelerate? The farther down you press the pedal, the faster the car accelerates. So the message to the car actually includes both the task to perform and additional information that helps the car perform the task. This additional information is known as a parameter (mentioned briefly in Section 4.3)—the value of the parameter helps the car determine how fast to accelerate. Similarly, a method can require one or more parameters that represent additional information it needs to perform its task. A method call supplies values—called ...

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